peatt



R. N. PRATT.

(No Model.)

STEAM VALVE.

No. 291,770. Patented Jan; 8, 1884.

FFICEs ATENT RUFUS N. PRATT, OF HARTFORD, CONNECTICUT, ASSIGNOR TO THE PRATT 8v CADY COMPANY, OF SAME PLACE.

STEAM-VALVE.

SPECIFICATION forming part of Letters Patent No. 291,770, dated January 8, 1884.

Application filed March 27, 1883. (No model.)

To aZZ whom it may concern:

Be it known that I, RUFUS N. PRATT, of Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Steam-Valves; and I do hereby declare that the following is a full, clear, and exact description thereof, whereby a person skilled in the art can make and use the same, reference being had to the accom- 1o panying drawings, and to the letters of reference marked thereon.

Like letters in the figures indicate the same parts.

Figure 1 is a view in central section of my improvement as embodied in a straight-way valve. Fig. 2 is a view in central section of same in an angle-valve.

My invention relates to the class of fluidvalves in which a swinging flap is used; and

it consists in the peculiar and special combination and arrangement of parts, by which I secure in one body a check and stop valve back of the flap a rib or stop, 0, is formed, so curved as to present a bearing to the foot of 3 5 the spindle, under its center and substantially in the line of its axis, in all parts of the path of the flap in swinging. By screwing down the spindle, as shown in Fig. 1, the valve is securely closed and forms a stop-valve; but 0 by raising the spindle, as shown in Fig. 2 and in dotted lines in Fig. 1, a check-valve is formed.

In my improved valve-body any form of valve disk or packing may be used, although the drawings show the flap and rotary disk common to special forms.

I claim as my invention 1. In a check and stop valve, in combination, body a, having valve-seat b, swinging flap 0, having stop 0, with the curved sur face, and the screw-spindle e, the said curved surface forming a bearing for the foot of the screw-spindle 6, whereby the play of the flap is limited, all substantially as described.

2. In a check and stop valve, in combination, the screw-spindle and the swinging flap, bearing a curved stop, the surface of which at all points in the path of the flap in swinging bears on the spindle in line of its axis, all sub- 60 stantially as described.

RUFUS N. PRATT.

WVitnesses:

CHAS. L. BURDETT, 7M. H. MARsH. 

